i just replaced engine in my M5, so the old engine will be sold as parts or whole engine.
the problem was that the previous owner could not make paymets on the ride and he pour some water in to the engine and one of the rods got bent. ( warranty experied and he blamed on water got inside from a bad weather, insurance company bought that bs) before i took off the engine, it was working but it had that noise inside the engine from that bent rod. so i just replaed the engine and did not want to mess inside.
also you can drill out the bold from oil pan, not a big thing but, daaa it has to be done, time and money invested ofcourse.